Definition
Magnetic fields are produced by electric currents,
which can be macroscopic currents in wires, or microscopic currents associated
with electrons in atomic orbits. The magnetic field B is defined in terms of
force on moving charge in the Lorentz force law. The interaction of magnetic
field with charge leads to many practical applications. Magnetic field sources
are essentially dipolar in nature, having a north and south magnetic pole. The
SI unit for magnetic field is the Tesla, which can be seen from the magnetic
part of the Lorentz force law Fmagnetic = qvB to be composed of (
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